diff --git a/vm/interp/Interp.c b/vm/interp/Interp.c
index 4e7a7e3..706f5a4 100644
--- a/vm/interp/Interp.c
+++ b/vm/interp/Interp.c
@@ -914,6 +914,8 @@
         dvmThrowException("Ljava/lang/NullPointerException;", NULL);
         return false;
     }
+    assert (!IS_CLASS_FLAG_SET(((Object *)arrayObj)->clazz,
+                               CLASS_ISOBJECTARRAY));
 
     /*
      * Array data table format: